Low Energy Neutrino Generator on the Basis of FLUKA
H
Akhtari
Radiation Application Research School, Nuclear Science and Technology Research Institute, AEOI
author
M. J
Safari
Nuclear Engineering Faculty, Amirkabir University
Tehran – Iran
author
F
Abbasi Davani
Radiation Application Department, Nuclear Engineering Faculty, Shahid Beheshti University
Tehran – Iran
author
text
article
2018
per
Detection of low-energy anti-neutrino has certain applications in science and technology. Recently, the FLUKA collaboration, so-called the PEANUT model, has been developed which is capable of simulating all neutrino flavors from the threshold up to TeV. Here, the FLUKA code will be demonstrated as a neutrino event generator, upon emphasizing the interaction of low-energy electron anti-neutrino (i.e., those coming from nuclear reactors). The results which are reported in this paper show the applicability and capability of the code to be applied for such purposes. An important feature of the FLUKA code is its potential to track several types of particles (here most of them are considered as secondaries), and also the complicated geometries which imply that the present code is a powerful tool kit for neutrino engineering applications.
Journal of Nuclear Science and Technology (JONSAT)
Nuclear Science and Technology Research Institute
1735-1871
39
v.
3
no.
2018
1
8
https://jonsat.nstri.ir/article_217_3f7010d71ff42cc4b84fb55945cdc24c.pdf
dx.doi.org/10.24200/nst.2018.217
Analysis of Thermal Conductivity Degradation in Irradiated UO2 Fuel Due to Porosity Formation at High Burnup
B
Roostaii
Nuclear Reactor and Safety Research School, Nuclear Science and Technology Research Institute, AEOI
author
H
Kazeminejad
Radiation Application Research School, Nuclear Science and Technology Research Institute, AEOI
author
S
Khakshournia
Physics and Accelerators Research School, Nuclear Science and Technology Research Institute, AEOI
author
text
article
2018
per
One of the factors that changes the UO2 fuel thermal conductivity is the generated porosity in the fuel due to increasing burnup. At high burnups, the structure known as rim region, is created. This is due to the Xe depletion process from the fuel matrix, porosity formation, and fuel grain recrystallization, which in turn change the fuel thermal conductivity. In this paper by the use of existing low temperature high burnup fission gaseous swelling model with the progressive recrystallization for UO2 fuel, the matrix swelling terms are calculated and the evolution of the total volume porosity up to burnup of 120 MWd/kgU is estimated. For the study the effect of porosity formation on the irradiated UO2 thermal conductivity, the HALDEN correlation of the thermal conductivity is selected. Then, a porosity correction factor is developed based on an assumption that the fuel morphology is a three-phase type consisting of the pores, with no contribution to the matrix swelling and large pores due to intergranular bubbles with the contribution to matrix swelling dispersed in the fully dense material, composed of UO2 matrix and solid fission products. The predicted thermal conductivity, based on the present porosity correction factor, demonstrates an additional degradation of 25% due to porosity formation at the burnup levels around 120 MWd/kgU causing an increase in the fuel temperature.
Journal of Nuclear Science and Technology (JONSAT)
Nuclear Science and Technology Research Institute
1735-1871
39
v.
3
no.
2018
9
20
https://jonsat.nstri.ir/article_218_ce95904d410f71c51ec54bb12227a749.pdf
dx.doi.org/10.24200/nst.2018.218
Generation of Nonlinear Currents and Helicon Waves in a Semiconductor Quantum Plasma
A
Mehramiz
Physics Department, Factually of Science, Imam Khomeini International University
Qazvin – Iran
author
B
Rajabi
Physics Department, Factually of Science, Imam Khomeini International University
Qazvin – Iran
author
text
article
2018
per
In this paper, an analytical investigation has been presented on the excitation of nonlinear current densities and helicon waves resulting from the interaction of the electromagnetic pump waves in a semiconductor quantum plasma. For this parpose, a system of modified fluid equations has been used to find the nonlinear response of electrons in the semiconductor in the presence of an external magnetic field. It is shown that due to the interaction of two electromagnetic pump waves in the semiconductor medium, a pondermotive force at the beating frequency becomes finite and generates a helicon wave. Furthermore, the power carried by the excited helicon wave is calculated and evaluated relative to the typical parameters of a solid state plasma medium. The results indicate that the power of the excited wave gradually increases with the external magnetic field, as well as, the equilibrium density of the carriers, and decreases by the electron-phonon collision frequency.
Journal of Nuclear Science and Technology (JONSAT)
Nuclear Science and Technology Research Institute
1735-1871
39
v.
3
no.
2018
21
27
https://jonsat.nstri.ir/article_219_448b9f79fbb1d4c06411dda2e045ce6a.pdf
dx.doi.org/10.24200/nst.2018.219
A System Dynamics Model for Inventory Decisions in Radionuclide Generators
M
Ghadimi
School of Industrial Engineering, Iran University of Science and Technology-Tehran-Iran
author
M. A
Shafia
School of Industrial Engineering, Iran University of Science and Technology-Tehran-Iran
author
M. S
Pishvaee
School of Industrial Engineering, Iran University of Science and Technology-Tehran-Iran
author
B
Fallahi
Research Center for Nuclear Medicine, Dr Shariati Hospital, Tehran University of Medical Sciences,Tehran-Iran
author
text
article
2018
per
A system dynamics model for simulating radionuclide generators inventory management decisions is presented in this research report. The radiopharmaceutical is generated gradually from another radioactive element, so called mother element in the radionuclide generators, and after each extraction of the produced radioactive material, so called elution, the radiopharmaceutical is produced in the proportion of the residue from the mother element. Based on the remained mother element, production time dependence, mutual interaction of variables, nonlinear distribution function, and reproduction, lead to the incremental complexity of the mathematical model and cause the model making affair harder in common place operation research methods. In the proposed model appeared in this report, the above-mentioned factors are modeled and due to the nature of system dynamics models' development and the possibility of developing the boundary of the model, the feasibility of utilizing the model, as a basic one, in more complex modeling affairs is presented. The model behavior re-production tests and the system dynamics' extreme conditions, illustrate the validity of the proposed model. Ultimately, in this paper, several scenarios for the productivity raise are illustrated and twenty five percent improvement has been shown compared to the conventional models.
Journal of Nuclear Science and Technology (JONSAT)
Nuclear Science and Technology Research Institute
1735-1871
39
v.
3
no.
2018
28
43
https://jonsat.nstri.ir/article_220_390e6e6ac517e75454f9ce602e39affa.pdf
dx.doi.org/10.24200/nst.2018.220
Investigation of Performance of Commercially Available Nanofilter Membranes in Selective Separation of Uranium (VI) Ions from Iron (III)
M
Ghasemi Torkabad
Materials and Nuclear Fuel Research School, Nuclear Science and Technology Research Institute, AEOI
author
A. R
Keshtkar
Materials and Nuclear Fuel Research School, Nuclear Science and Technology Research Institute, AEOI
author
J
Safdari
Materials and Nuclear Fuel Research School, Nuclear Science and Technology Research Institute, AEOI
author
text
article
2018
per
Performance of Three commercially available nanofilter membranes (PES-2 , NF-1 and NF-2) in terms of rejection, permeate flux, and membrane selectivity under a variety of operational conditions was evaluated for selective separation of uranium (VI) ions from iron (III). The membranes permeate fluxes were decreased with an increase in the pH range of 3-6, while the rejection of ions was increased. Uranium rejection with these membranes was lower than iron rejection and the PES-2 and NF-1 membranes had the maximum membrane selectivity of iron over uranium at pH 4. The maximum membrane selectivity of NF-2, however, was 2.97 at pH 3. The PES-2 membrane had the maximum iron rejection of 72.25% at the pressure 10 bar. For NF-1 the rejection of iron and uranium was found to be relatively constant (about 97% and 84%, respectively) against increasing the pressure. As the pressure increased from 5 to 20 bar, iron rejection by NF-2 was remained constant (about 97%) but uranium rejection by this membrane was decreased from 84.06% to 70.46%. It was found that the effect of increasing the iron concentration from 0.12 to 1mM on the behavior of these membranes is different. The maximum membrane selectivity of uranium over iron by the NF-1 and NF-2 membranes was 43.71 and 13.59, respectively, which showed that NF-1 has a very desirable performance. It seams that the relatively new process of nanofiltration has a good potential for selective separation of uranium from iron.
Journal of Nuclear Science and Technology (JONSAT)
Nuclear Science and Technology Research Institute
1735-1871
39
v.
3
no.
2018
44
56
https://jonsat.nstri.ir/article_221_dbb3a621729a21e528c6bb6a4dd8644d.pdf
dx.doi.org/10.24200/nst.2018.221
Extraction and Transport of Thorium(IV) by Polymer Inclusion Membranes Incorporating Di-(2-ethylhexyl) Phosporic Acid as the Carrier Extractant
H. R
Arabi
Chemical Engineering Department, Tehran University-Tehran- Iran
author
S
A. Milani
پژوهشکدهی مواد و سوخت هستهای، پژوهشگاه علوم و فنون هستهای، سازمان انرژی اتمی ایران
author
H
Abolghasemi
دانشکدهی مهندسی شیمی، پردیس دانشکدههای فنی دانشگاه تهران، تهران ـ ایران
author
text
article
2018
per
Extraction and transport of thorium (IV) from nitrate solutions was investigated using polymer inclusion membrane (PIM), based on di(-2-ethylhexyl) phosphoric acid (D2EHPA) and poly(vinyl chloride) (PVC). This study investigates the influence of the main system parameters (i.e., pH of donor phase, type and concentration of acid in acceptor phases, percentage of D2EHPA in the membrane, initial Th(IV) concentration) on the extraction and transport process by means of batch method. The transport factor of Th(IV) as high as 94.81% were recorded using a membrane composed of 45% D2EHPA, and 55% PVC (w/w) from a solution containing 112 mg L-1 Th(IV) in 0.0158 mol L-1 HNO3 (pH 1.8) into a solution containing 3 mol L-1 H2SO4.
Journal of Nuclear Science and Technology (JONSAT)
Nuclear Science and Technology Research Institute
1735-1871
39
v.
3
no.
2018
57
67
https://jonsat.nstri.ir/article_222_6d588fb143444d0c05e8897d42613109.pdf
dx.doi.org/10.24200/nst.2018.222
Study and Statistical Analysis of Geochemical Relations Active Elements in Sedimentary Phosphate Layers of Kuh-e- Lar Zagros-Anticline
FARID
BOLOURCHIFARD
Faculty Member
author
BEHZAD
MEHRABI
Faculty Member- Kharazmi University
author
Ayyub
Memar
پژوهشکدهی مواد و سوخت هستهای، پژوهشگاه علوم و فنون هستهای، سازمان انرژی اتمی ایران
author
FARAJOLLAH
FAYAZI
گروه زمینشناسی، دانشکده علوم زمین، دانشگاه خوارزمی، تهران ـ ایران
author
text
article
2018
per
In this research, the layers of the sedimentary environment of the Pabdeh formation, which have different variation amounts of phosphate minerals (Apatite), were studied. The XRF and XRD analyses were performed for determination of the minerals and the radioactive elements, REEs and compounds for 54 selected samples (with high amounts of P2O5). According to the importance of the geochemical elements relations and their interpretation, the statistical analysis methods cluster analysisand principal component analysis, (PCA) were used. According to the results of the component correlation matrix, after rotation through the direct oblimin method, and normalizing with Kaiser method, the amounts of components and the ratio between them are well illustrated and the XRF results were divided into two principal components.
Journal of Nuclear Science and Technology (JONSAT)
Nuclear Science and Technology Research Institute
1735-1871
39
v.
3
no.
2018
68
78
https://jonsat.nstri.ir/article_224_b4b0c18f0594b0d5b96bdb302241c3da.pdf
dx.doi.org/10.24200/nst.2018.224
The Introduction of Volcanogenic Uranium Mineralization Using
Geological, Alteration, Mineralization and Geochemical Evidence at East Bam (South - East of Iran)
M
Goudarzi
گروه زمینشناسی، دانشکده علوم، دانشگاه لرستان-
لرستان ـ ایران
author
H
Zamanian
گروه زمینشناسی، دانشکده علوم، دانشگاه لرستان - لرستان ـ ایران
author
A
Javanshir
گروه زمینشناسی، دانشکده علوم، دانشگاه تربیت مدرس، تهران ـ ایران
author
M.R
Rezvanianzadeh
پژوهشکدهی مواد و سوخت هستهی، پژوهشگاه علوم و فنون هستهای، سازمان انرژی اتمی ایران
author
M. R
Ghaderi
دانشکده فنی، دانشگاه تهران، تهران ـ ایران
author
text
article
2018
per
The studied area is located in the central Iran micro-continent, in the southern part of Lut block, 45 kilometers east of Bam Township. The main units of the area are mostly intercalation of pyroclastic rocks and lava layers in the age of Eocane, with the general trend of southwest- northeast and include high potassium calc- alkaline magma that their formation are related to the tectonic environments of magmatic arc and subduction zone. Argillic, silica, hematite, zeolite and chlorite alteration are observed in the area in relationship with uranium mineralization. The geochemical complexes related to uranium presence were identified in the study area. They are: complexes in relation with acidic and moderate rocks, including U-W-As-Mo-S-Cu-Ag, and complexes related to the basic igneous rocks, including U-Ni-V-Ag-Co-W-Mo-Cr-Cu-S. The main observed structures and textures in this area involve stock work, vein veinlet, corrosion, radial, release and peripheral membrane. The main mineralization in the area includes uranium secondary minerals contains Boltwoodite, Phosphuranylite and carnotite, manganese oxides, iron oxides and hydroxides, a few sulfide, zeolite mineral group and other minerals groups which mostly are formed under the influence of hydrothermal and late supergene processes. Based on a comparison pattern of mineralization in the area and its adjustment with the geological, alteration and geochemical conditions in uranium deposits, the most possible choice for mineralization type in the area has been introduced as volcanogenic uranium mineralization.
Journal of Nuclear Science and Technology (JONSAT)
Nuclear Science and Technology Research Institute
1735-1871
39
v.
3
no.
2018
79
102
https://jonsat.nstri.ir/article_225_2fa16fb26ea61b0ea63447df80e4ba8c.pdf
dx.doi.org/10.24200/nst.2018.225
The Study of Scattering and Transport of Electron Beam Into Dense Fuel for Fast-Shock Ignition Approach
S. A
Ghasemi
پژوهشکدهی پلاسما و گداخت هستهای، پژوهشگاه علوم و فنون هستهای، سازمان انرژی اتمی ایران
author
A. H
Farahbod
پژوهشکدهی پلاسما و گداخت هستهای، پژوهشگاه علوم و فنون هستهای، سازمان انرژی اتمی ایران
author
text
article
2018
per
The stopping power, penetration and scattering of high energy electrons with different energy distribution functions into dense fuel and hot-spot (fuel core) have been considered for a fast-shock ignition scenario. The analytical calculations indicate that fast electrons with two-temperature energy distribution function penetrate more into the dense fuel, in comparison with the monoenergetic and exponential function, where it is consistent with the MCNPX simulation results. Furthermore, the scattering of energetic electron beams toward the outer surface of the fuel for five various fuel density and two fast ignitor wavelengths of 0.53 and 0.35 micron have been investigated. The results show that for the fuel mass smaller than 2 mg, the scattering of electrons reduce for the electrons with smaller energies and fast ignitor of smaller wavelengths. Meanwhile, for the electrons with energy of the order ~3.5 MeV, two-temperature and monoenergetic energy distribution function deliver the highest and lowest energy to the main fuel and the central hot-spot, respectively.
Journal of Nuclear Science and Technology (JONSAT)
Nuclear Science and Technology Research Institute
1735-1871
39
v.
3
no.
2018
103
112
https://jonsat.nstri.ir/article_226_9d1b8081cfb86c5782271b1e82fbb9d5.pdf
dx.doi.org/10.24200/nst.2018.226
Spray System Assessment in Steel Containment of VVER-1000 Reactor with Using Probabilistic Methods
D
Masti
شرکت بهرهبرداری نیروگاه اتمی بوشهر، سازمان انرژی اتمی ایران، بوشهر ـ ایران
author
A
Khosroabadi
شرکت بهرهبرداری نیروگاه اتمی بوشهر، سازمان انرژی اتمی ایران، بوشهر ـ ایران
author
A
Rahmani Haghighi
شرکت بهرهبرداری نیروگاه اتمی بوشهر، سازمان انرژی اتمی ایران، بوشهر ـ ایران
author
text
article
2018
per
One of the most important safety systems is spray system which is located in steel containment and has been designed to limit radioactive materials release, specially iodine, and to reduce the pressure and temperature in steel containment during events. The functions of mentioned system have been evaluated by the NPP designer by using probabilistic methods and the Risk Spectrum code. Some of the equipment, however, have not been simulated in the implemented modeling. In this article, by using the probabilistic analysis and the SAPHIRE code, the importance of the spray system’s elements in steel containment has been analyzed and the probability of system failures in various conditions has been calculated.
Journal of Nuclear Science and Technology (JONSAT)
Nuclear Science and Technology Research Institute
1735-1871
39
v.
3
no.
2018
113
118
https://jonsat.nstri.ir/article_227_18b3499132ff1952c79943740733ae40.pdf
dx.doi.org/10.24200/nst.2018.227